JUNIOR SECONDARY SEMI-EXTERNAL EXAMINATION

1 MoEAC/NIED JS Physical Science Specimen Paper [Turn over School .. Grade 9 .. JUNIOR SECONDARY SEMI-EXTERNAL EXAMINATION PHYSICAL SCIENCE PAPER - Written 2 hours 30 minutes Marks 130 Specimen Paper Additional Materials: Soft pencil (HB type is recommended) Non-programmable calculator INSTRUCTIONS AND INFORMATION TO CANDIDATES Learners answer on the Question Paper in the spaces provided. Write your Name in the space at the top of this page. Write in dark blue or black pen. You may use a soft pencil for any rough work, diagrams or graphs. Do not use correction fluid. Do not write in the margin For Examiner s Use. Answer all questions. Answer section A on the multiple choice answer sheet provided. The number of marks for section B is given in brackets [ ] at the end of each question or part question. The Periodic Table is printed on page 24.]

2 For Examiner s Use Section A Section B Total This document consists of 25 printed pages and 1 blank page. Republic of Namibia MINISTRY OF EDUCATION, ARTS AND CULTURE 2 JS Physical Science Specimen Paper SECTION A: MULTIPLE CHOICE QUESTIONS Answer this section on the multiple choice answer sheet provided. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and mark your choice in soft pencil on the separate answer sheet. Each question counts one mark. If you want to change an answer, erase completely the one you wish to delete. 1 The diagram shows the set up of an experiment. What is the main purpose of the experiment? A To find the density of the stone. B To find the mass of the stone. C To find the temperature of the stone. D To find the volume of the stone. 2 Which of the following is a way of finding the exact value of a quantity?

3 A classification B estimation C measurement D observation 3 How many hours are equivalent to15 minutes? A hours B hours C hours D 900 hours 3 JS Physical Science Specimen Paper [Turn over 4 Substances can be classified as elements, compounds or mixtures. Which diagram(s) represent (s) a mixture? A I and II B II and III C only I D only II 5 The diagram shows the outline of the Periodic Table. Which letter, A, B, C or D, represents an element in group 2 and period 3 ? 6 The diagrams show structures of different atoms. Which diagram represents the structure of an aluminium atom? 4 JS Physical Science Specimen Paper 7 The diagram shows the electronic structure of sodium atom. What is the nucleon number of sodium atom? A 11 B 12 C 23 D 24 8 The diagrams show different molecules. Which diagram shows a diatomic element? 9 Most inorganic fertilisers contain the compound ammonium nitrate.]

4 Ammonium nitrate is made up of ammonium (NH4+) ions and nitrate (NO3-) ions. What is the chemical formula for ammonium nitrate? A (NHNO)7 B NH3NO4 C NH4NO3 D NHNO 10 Acids are common in fruits. Which acid is found in fruits? A acetic acid B citric acid C lactic acid D nitric acid 5 JS Physical Science Specimen Paper [Turn over 11 What is the colour of a universal indicator in pure water? A green B orange C red D violet 12 The diagram shows a pH scale indicating different substances. Which combination of substances represents a weak acid and a strong base? A W and Y B W and Z C X and Y D X and Z 13 Which process can be used to control the pH of acidic soil? A combustion B decomposition C neutralisation D respiration 14 Which gas is produced when zinc granule reacts with dilute sulfuric acid? A carbon dioxide B hydrogen C oxygen D sulfur dioxide 6 JS Physical Science Specimen Paper 15 The diagram shows a spoon made from an alloy.]

5 Which alloy is used to make the spoon? A alnico B brass C bronze D steel 16 When metals and non-metals react with oxygen they form oxides. Which of the following is an acidic oxide? A carbon dioxide B calcium oxide C magnesium oxide D sodium oxide 17 The diagram shows forces A, B, C and D acting on a moving car. Which arrow A, B, C or D represents the force due to friction? 18 What is the correct measuring instrument and unit of weight? instrument unit A beam balance N B beam balance kg C spring balance kg D spring balance N 7 JS Physical Science Specimen Paper [Turn over 19 A girl of 400 N walks up a stair case as shown in the diagram. How much gravitational potential energy does she gain as she reaches the top level? A 120 J B 200 J C 400 J D 1200 J 20 The diagram shows a car tyre. Which statement explains why the car tyres are made with deep grooves on their surfaces?]

6 A To decrease friction. B To decrease pressure C To increase pressure. D To increase friction. 21 Which process is described as the spreading of particles of one substance amongst the particles of another substance? A compression B contraction C diffusion D Expansion 8 JS Physical Science Specimen Paper 22 The diagram shows phase changes. In which phase changes do particles gain energy? A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4 23 The diagram shows a 200 g rectangular block with dimensions 5 cm x 2 cm x 3 cm. What is the density of the rectangular block? A g/cm3 B g/cm3 C g/cm3 D g/cm3 24 A syringe contains a gas of volume 40 cm3. This volume is reduced to 20 cm3. The temperature remains the same. How does the gas pressure and collision of particles in the syringe change? gas pressure collisions of particles A decreases decrease B decreases increase C increases increase D increases decrease 9 JS Physical Science Specimen Paper [Turn over 25 The diagram shows four objects of the same weight placed on a level surface.]

7 Which object exerts the greatest pressure on the contact surface S? 26 The diagram shows an incomplete circuit? Which component should be connected in the space to measure current? 27 An object can be either positively or negatively charged. Which statement explains the existence of charge? A Balance of electrons and neutrons. B Balance of protons and electrons. C Imbalance of protons and electrons. D Imbalance of protons and neutrons. 10 JS Physical Science Specimen Paper 28 Which connection ensures that all other bulbs remain lighted after any one of the bulbs breaks? 29 Which of the following is a source of chemical energy that can be used to produce electrical energy? A candle B cell C sun D water 30 The planet Earth behaves like a bar magnet. Which diagram shows a bar magnet that represents the Earth s magnet? 11 JS Physical Science Specimen Paper [Turn over For examiner s use SECTION B: STRUCTURED QUESTIONS Write your answers in the spaces provided on the question paper.]

8 Legible handwriting and neat drawings in pencil, where required, are essential. Answers to numerical calculations must have the correct unit. Symbols must be written/drawn correctly. Incorrect spelling of element names and scientific terminology will be penalised. 1 The diagram shows the setup used to determine the mass of a liquid. (a) Identify the instrument used to measure the mass of the liquid.. [1] (b) Find the volume of the liquid. cm3 [1] (c) Determine the mass of the liquid. Show your working. mass .. g [2] (d) (i) Calculate the density of the liquid. density =.. g/cm3 [2] (ii) Deduce whether the liquid will float or sink in water. Explain your answer.. [2] [8] For examiner s Use 12 JS Physical Science Specimen Paper 2 The table shows information about different elements Q, R and S. (a) Use the Periodic Table on page 24 to complete the table.

9 Element number of protons number of electrons electronic configuration group number period number Q 5 5 (i) .. 3 2 R (ii) .. 17 2, 8, 7 (iii) .. (iv) .. S 20 (v) .. 2, 8, 8, 2 2 4 [5] (b) The diagram shows the atomic structure of element X. (i) State the name of element X.. [1] (ii) Draw a similar structure of oxygen atom. [3] (c) Sodium reacts with oxygen to form sodium oxide. (i) Name the type of bond formed between sodium and oxygen.. [1] (ii) Draw diagrams to show how the bond between sodium and oxygen is formed. [4] [14] For examiner s Use 13 JS Physical Science Specimen Paper [Turn over For examiner s use 3 Changes in nature can be classified as physical or chemical. (a) Give two differences between a physical and chemical change.. [2] (b) State whether the following changes are chemical or physical. (i) fruit ripening .. [1] (ii) ice cube melting.]

10 [1] (c) The diagrams X, Y and Z are examples of chemical reactions. (i) Identify the chemical reactions represented by X, Y and Z as decomposition, synthesis or combustion reaction. X .. Y .. Z .. [3] (ii) Burning a match is an exothermic reaction. Explain what is meant by exothermic reaction.. [1] [8] For examiner s Use 14 JS Physical Science Specimen Paper 4 In an experiment, a learner is given a sample of each of the following substances to determine whether they are acidic, basic or neutral. The table shows her results after testing the samples with litmus papers. sample effect on blue litmus paper effect on red litmus paper nature of sample fanta cool drink (i) .. remains red acidic distilled water remains blue remains red (ii) .. soap water remains blue (iii) .. basic vinegar turns red remains red (iv) .. eno solution (v) .. (vi).